The Hydrapak Plug-N-Play™ 42mm Cap is the perfect way to stay hydrated on the go! This lightweight and durable cap features a twist-on, twist-off design that makes it easy to fill and seal - no more fiddling with hard-to-open lids. With its leak-proof seal and ergonomic design, you can be sure your water will stay put no matter where you take it. Get ready to take your hydration game to